doc: move away translations from top-level index

In translations/ we have now a dedicated index.rst where we add/remove
references to translations. Translations are in English alphabetical
order.

Signed-off-by: Federico Vaga <federico.vaga@vaga.pv.it>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/translations/index.rst b/Documentation/translations/index.rst
new file mode 100644
index 0000000..4969c58
--- /dev/null
+++ b/Documentation/translations/index.rst
@@ -0,0 +1,12 @@
+.. _translations:
+
+============
+Translations
+============
+
+.. toctree::
+   :maxdepth: 1
+
+   zh_CN/index
+   ko_KR/index
+   ja_JP/index